RFR: 8272777: Clean up remaining AccessController warnings in test library

[Serguei Spitsyn]

On Wed, 2 Feb 2022 21:35:59 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> Reduce noise in test output by adding the @SuppressWarnings("removal") annotation (which has already been widely applied).

Marked as reviewed by sspitsyn (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7328